Monday broker round-up - UPDATE

AMEC: Investec keeps buy rating and 1,300p target.AVEVA: Merchant Securities maintains buy recommendation and 1,800p target; Invetec cuts target from 1,900p to 1,850p, buy rating kept.Barclays: Investec maintains buy rating and 240p target.BHP Billiton: UBS cuts target from 2,500p to 2,400p, buy rating maintained.Daily Mail & General Trust: Investec reiterates buy rating and 578p target.Dixons Retail: AlphaValue upgrades from add to buy, target left at 21.4p.Dragon Oil: Nomura maintains buy recommendation and 781p target.International Power: Investec downgrades from buy to hold, target lifted from 417p to 422p.Mondi: Jefferies reiterates buy rating and 665p target.National Grid: Investec ups target from 547p to 549p, sell rating kept.Rio Tinto: Credit Suisse keeps outperform rating and 4,650p target.SABMiller: Credit Suisse keeps outperform rating and 2,900p target.United Utilities: Nomura keeps buy rating and 695p target.BC